What's so wonderful about end caps? The endcapless type is a clever invention, I think---probably less expensive to manufacture and more reliable besides, other things being equal. You can, if you like, buy cartridge filters with end caps to fit those cars, including Frams and some Purolators. As Z06 alludes, the efficiency of Toyota filters has been questioned, but that's a separate issue.

Gebo, I don't think you're messed up... Or if you are, we both are then.

You are where I was at the time of my switch to WIXs 51348 for my 2004 four cylinder Tacoma close to five years ago. I have run these mostly with a few Fram XG3614s thrown in since switching away from the D1/D3s... I just couldn't get thru the supposed efficiency hit for the D1s/D3s.

The same glue holding the filter together with or without endcaps will fail just the same. Next time, just tear one apart to get the idea how much hydrolic pressure it will take, and then think in what situation will your filter be exposed to such pressure.

... Efficiency is nice to have, but if the filter completely collapses in on itself and blocks the flow of oil, then efficiency isn't going to do you much good when there's no oil flowing to the engine.

At least in the case of cartridges for my car ... In the no-end-cap Toyota (Denso) filter, the inside diameter of the media fits reasonably closely around the center tube of the filter cap, so that that tube prevents "the filter collapsing in on itself," just like the center tube in a spin-on filter. In aftermarket replacements I've seen with end caps, there's more radial clearance between the media and the center tube, so the media hypothetically could crush inward more. Some makes and models have a wider gap than others. That said, I used one with a relatively large gap, and it did not collapse at all. Anyway, better support against inward collapse looks to be an advantage of the no-end-cap type.

I've use the YZZA1 canter filters on my 2007 sienna and 2014 sienna. The 07 got to 150Kmiles before the inside got so bad (kids) the wife wanted new. I've put a dozen or so filters in it and never had one show any signs of damage or calapse.

On the 07 I left it one for 15K miles because when I got it (with 19K miles), I didn't have a canister wrench and the PO tightened the [censored] out of it. The 07 was a former RENTAL as well. This is with the ole piston slap noise when accelerating. Still rolled passed 150K miles.

Relax, its easy nowadays. You really have to go out of your way to get an oil or filter that will substantially shorten the life of your engine.

The same glue holding the filter together with or without endcaps will fail just the same. Next time, just tear one apart to get the idea how much hydrolic pressure it will take, and then think in what situation will your filter be exposed to such pressure.

Thanks, I will do what you suggest. The issue was my imagination in seeing the unfiltered oil seeping in between the end of the folded filters. I felt the end caps prevented the unfiltered oil from sneaking into the ends of the folds.